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  1. #1
    is thinking. grantuk's Avatar
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    RXP 155 tuning & speed

    Has anyone spent any time tuning this ski? If so, what did you do and what speed speeds did you get?

    Please donít suggest buying a supercharged ski for speed as this will be raced in a normally aspirated open class.

    Thanks in advance.


  2. #2
    There was one racing in Australia, not sure of details

  3. #3
    TAB686's Avatar
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    I can help with info on my gti155 se if that helps. Same drivetrain.
    61 gps mph. With tune, stock repitch, plate holes filled in, imuk, 180lb rider. Custom Air intake is next.
    Last edited by TAB686; 02-23-2020 at 06:21 PM.

  4. #4
    is thinking. grantuk's Avatar
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    Quote Originally Posted by TAB686 View Post
    I can help with info on my gti155 se if that helps. Same drivetrain.
    61 gps mph. With tune, stock repitch, plate holes filled in, imuk, 180lb rider. Custom Air intake is next.
    Thanks,
    whats an imuk? What reflash are you using at what rpm?

    I believe the RXP hull is faster than the GTI, looking for 65+ on this.

  5. #5
    connorrxp's Avatar
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    When you take the flame arrestor out of the intake manifold is an Imuk (intake manifold upgrade kit). Might be worth it to lighten flywheel cam and cam gear. Toss a cam regrind in but that will complicate the reflash/tune. The tune will need to match the cam in order to see any results. I'm not sure what n/a rules are but it might be worth it to get some high compression pistons made

  6. #6
    TAB686's Avatar
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    Quote Originally Posted by grantuk View Post
    Thanks,
    whats an imuk? What reflash are you using at what rpm?

    I believe the RXP hull is faster than the GTI, looking for 65+ on this.
    Thats the flame arrestor. Did it the hard way with long needle nose pliers throught the throttle body flange and 2 beers..lol 8500 rpm limiter running 7650 ish at 61mph race labs tune.
    Click image for larger version. 

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  7. #7
    is thinking. grantuk's Avatar
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    Thanks, I know how to make the power, just curious to see if anyone has spent time tuning this hull and motor combo.

  8. #8
    TAB686's Avatar
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    What is the ski running now stock.
    Keep us updated with any results.

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